BK7 Double Concave Lenses

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Specifications

Material: BK7, UVFS, CaF2, ZnSe, H-K9L
Diameter: 3 mm
Focal Length: -6 mm
Edge Thickness, Te: 1 mm
Lens Type: Bi-Concave
Material: BK7
Design Wavelength: 587.6nm
Diameter Tolerance: +0.0/ -0.1mm
Center Thickness Tolerance: ±0.1mm
Surface Figure: λ/4 @633nm
Focal Length Tolerance: ±1%
Centration: 3 arc min.
Surface Quality: 40/20 -60/40
Bevel: 0.2×45°
Coating: Uncoated or Customized AR
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Features



  • Diverging Optics: Engineered to diverge parallel light, the double concave lens is ideal for applications requiring the dispersion of light beams, such as beam expansion and light projection.

  • Negative Focal Length: Unlike convex lenses, the double concave lens has a negative focal length, enabling it to diverge light rays outside the lens.

  • Uniform Curvature: Both sides of the lens feature the same radius of curvature, ensuring symmetrical light dispersion and consistent optical performance.

  • Broad Spectral Range: Constructed from high-quality BK7 material, these lenses offer excellent transmittance from visible light to near-infrared wavelengths (350-2000nm), providing versatility across various optical setups.

  • Precision Design: Engineered with precise diameter and center thickness tolerances, guaranteeing uniformity and reliability in optical performance.
    Optimized Surface Quality: Features λ/4 surface figure at 633nm, minimizing optical aberrations and ensuring high-quality imaging.

  • Customizable Options: Available in various diameters (Dia), effective focal lengths (EFL), back focal lengths (BFL), center thicknesses (CT), and edge thicknesses (ET), providing flexibility to meet specific application requirements.

  • Coating Options: Offered with optional custom anti-reflective (AR) coatings to enhance light transmission and reduce glare, optimizing performance in different lighting conditions.


Summary:



  • Material: BK7

  • Design Wavelength: 587.6nm

  • Diameter Tolerance: +0.0/-0.1mm

  • Center Thickness Tolerance:  ±0.1mm

  • Surface Figure: λ/4 @633nm

  • Focal Length Tolerance: ±1%

  • Centration: 3 arc min.

  • Surface Quality: 40/20-60/40

  • Bevel: 0.2×45°

  • Coating: Uncoated or Customized AR


Applications


  • Beam Expansion: Utilized to expand the diameter of a light beam in applications such as laser systems, optical instruments, and illumination setups.

  • Light Projection: Applied in projection systems, optical projectors, and imaging devices to control the spread and direction of light beams.

  • Optical Instrumentation: Integrated into optical setups and experimental apparatus for light dispersion, beam shaping, and optical alignment.

  • Scientific Research: Used in laboratories and research facilities for spectroscopy, interferometry, and other optical experiments requiring controlled light dispersion.

  • Industrial Applications: Employed in industrial measurement systems, optical sensors, and laser processing equipment for precise light manipulation and beam control.